On 12th March 2001, the EC Council adopted the new Acquired Rights Directive 2001. This repeals and replaces the Acquired Rights Directive 1977 (which is the source of the TUPE regulations).
The preable states it is a codifying Directive and, indeed, on reading it I have been unable to find any material differences between it and the 1977 Directive (as amended).
Nevertheless, for those who want to see it, it can be downloaded from http://europa.eu.int/eur-lex/en/dat/2001/l_082/l_08220010322en00160020.pdf
The implementation date is the 20th day following its publication in the Official Journal of the European Communities - which could be very soon, or quite some time away!